Hoisting mechanism.



F, a c. E. mms.

. HOISTIIIG IECHANISI.

APPLICATIDI FILED OCT. 5, 1914.

Emma Jan. 16,1917.

3 SHEETS-SHEET I.

' F. C; E: MARIS- HOISTING "mums". Armcmou min ocr. 5.1914.

Patnfed Jan.116, 1917.

' 3 SHEETS-SHEET 2.

F. Jr C. E. MARIS- HOISTING IEQHANISI- APPLICATION mm on. i, 1914.

Patented Jan. 16,1917.

3 SHEETS-SHEET 3- 4 1 *flw 2 UNITED STATES PATENT OFFICE.

' FRANK MABIS AND CHARLES E. MARIS, OF LANSDOWNE, PENNSYLVANIA,ASSIGNORS TO ANNA PICKERING MARIS AND ELIZABETH PENNOCK MALRIS, BOTH OFLANS- nownn, rmmsrnvnmn.

HOISTING MECHANISM.

Specification of Letters Patent.

Patented Jan. 16, 1917.

' cation.

One object of our invention is to provide a motor-driven hoist whichshall include a novel and relatively'simple as well as a compactcombination of parts for transmitting power from the motorto thehoisting drum;

the invention contemplating a novel form of automatically acting holdingmeans for pre- Venting revolution of the drum when the motor ceases toact.

A further object of the invention is to provide novel means forsupporting the gearing connecting the motor with the hoisting drumwhereby the action of a load on said drum shall cause the gearingtoapply a clutch to prevent revolution of the drum when the electriccurrent or other motive power is cut off from the motor.

Another object of the invention is to provide novel means formaintaining the holding clutch of a hoisting apparatus out of actionwhen the driving motor is 1n operation.

These objects and other advantageous ends we secure as hereinafter setforth, reference being had to the accompanying drawings, in which,

Figure 1, isa vertical longitudinal section of a hoisting apparatusconstructed according to our invention; Fig. 2, is an end elevation ofthe apparatus shown in Fig. 1; Fig. 3,

is a transverse section on the line a-a Fig. 1

Fig.4, is a horizontal section on the line b?) Fig. 2; Fig. 5, is aperspective view of certain of the parts included in our invention,

and Fig. 6, is a diagrammatic representation 2 "of the connectionsbetween the electromagnetic winding and the motor controller.

In the above drawings, ,1 represents an electric motor which may be ofany desired construction and may. obviously be replaced in some cases byother sources of motive power without departing from our lnventlon.

This motor is rigidly fixed to an elongated frame or casing whose partsare indicated at 2,3, 4, and 5, and which at a suitable pointprovides abearing for a prolongation 6 of the armature shaft 7 of saidmotor towhich It is operatively connected by a coupling 8. The part 2 of thecasing structure serves as a spacer between the motor and the part 3 andthis latter section provides a bearing for one end of the hoisting drum9, whose opposite end has a sleeve portion extended through a partition10 of the casing section 4 and journaled in asleeve 11 therein. Theextended end of the drum has keyed or otherwise fixed to it a gear 12 bymeans of which it is rotated.

In the chamber formed by partsd and 5 of the casing sections androtatably mounted on the sleeve 11 and on a second sleeve 13 carried bypart ofthe casing section 5, is aframe 14 consisting of two end memberssuitably connected together and providing bearings for two shafts 15 and16. On the first of these are mounted a large gear 17 able head 22 whichin this instance carries on its outer face an. annular electro-magneticwinding 23 which may be made in two or more separately energiz'ablesections and having as an armature a flanged plate or cap 24 mounted ona core structure 25 concentric with the winding. As 'shown in 4, thisplate 24 has fixed to it a pair of bars 26 extending through and guidedby the head 22, while their innerends are rigidly connected to acircular plate or disk 27 within a chamber 5 of the casing 5. In thischamber are mounted two series of, annular plates 28 and 29 of whichthose of the first series alternate with those of the other series andare recessed for the r eception of thebars 26, being held from turningby means of lugs on the inner surface of the chamber 5 engagingcorresponding notches at the outer edge of theplates 28.

The plates of the second series are keyed or otherwise fixed to a sleeve30 attached to the end of the motor driven shaft 6 so as to be turnedthereby. These parts are so designed and proportioned that when thewinding of the electro-magnet 23 is enertardation of the revolution ofthe shaft 6.

At that end of the series of plates adjacent the electro-magnet 23 is anabutment plate .28 toward which all of the other plates are pressedunder certain conditions. While the carrier frame 14 is rotatablymounted, its movement about its axis is extremely limited, sinceadjacent .one of its transverse members 31 there is provided within thecasing section 5 an abutment 32, and on the opposite side of said framea second transverse member 33 is so placed asto lie immediately adjacentor in contact with one arm of a bell crank lever 34 mounted on a pivotor fulcrum 35 carried by the frame section 5. Also fulcrumed on asuitable pivot 36 is an arm 37, in thepresent case extendinghorizontally across the upper part of the casing section 5 in such a.pos1t1on that it is engaged adjacent its fulcrum by the second arm, ofthe bell-crank lever 34 while its extremity engages a third lever 38.This latter is in the form of an arm having two branches, each of whichhas a projecting lug 39 extending into engagement with the pressureplate 27 on the bars 26; this same arm having also a right angleextension 40 forming a fulcrum which is seated in a recess of thesection 5 so as to allow movement of said arm.

Under conditions of use the motor 1 has all or a portion of its windingsconnected in circuit or through a shunt vwith the electro-magneticwinding 23, so that whenever it is driven in a direction to raise aload, the plate 24 is drawn toward the head 22 and, through the bars 26,holds the pressure plate 27 away from the other plates .of the holdingclutch, thereby permittingfree turning of the shaft 6. This latter,therefore, turns the hoisting drum 9 through the I gears 21, 17, 19, 20,and 12 to raise a load.

If for any reason the current driving the motor should fail or be cutoil, the load on vthe hoisting drum would at once tend to cause rotationthereof, with the result that the gear12, by reason of its engagementwith the gear 20 on the carriage 14, rotates said carriage in aclockwise direction in Fig. 3, or counterclockwise in Fig. 2, causingits member 33 to press upwardly against the arm of the bell-crank lever34.. This latter then exerts pressure upon the lever 37 which in turnpresses the lugs 39 of the lever 28 against the pressure plate 27 with aforce proportional to that tending to rotate the drum, plus a force dueto the weight of certain of the parts. This pressure causes the plates29 to be gripped and held by the aeraeer plates 28 so that the shaft 6with the train of gears and consequently the hoisting drum, iseffectually held from turning.

The connections of the controller which governs the operation of themotor are such that the electro-magnet 23 is energized only when saidmotor is operatedin a direction to hoist the load attached to the drumand when the load is being lowered the drum is ordinarily driven by themotor without the pressure on the plate 27 being released. In certaincases the electro-magnet 23 may be made in a number of sections and thecontroller so constructed andv connected that when the load is beinglowered, one or more of these sections is energized so that a portion ofthe retarding force due to the clutch is neutralized. Thus in Fig. 6 wehave shown the magnet winding as divided into two parts 23 and 23", bothof which are in circuit when the motor controller is so operated as tocause its movable contacts 50 and 51 to engage its fixed contacts 52 and53 respectively, one of which is connected to a source of current supplywhile the other is in connection with controller contacts governing theflow of current to the motor. Under these conditions the motor wouldoperate to hoist a load and as above pointed out, the

magnet 23 being fully energized, would cause complete release of theclutch.

When the controller is operated to lower the load, the fixed contacts 52and 53 thereof are engaged by the movable contacts 54 and 55,thus-causing but a portion 23 of the coil 23 to be supplied with currentso that a certain amount of force is exerted to slack off the pressureholding the clutch plates together.

Obviously if desiredthe contacts 54 and 55 with their connections may beomitted.

so that the clutch is released while the' motor is hoisting and exertingits full retarding force when it is lowering. .In any case when currentis supplied to the motor to hoist the load the electro-magnet isenergized and through the system of levers swings the frame 14 with itsgears about the shaft 6 as an axis until the pressure on the brake isreleased, after Which the gears are driven in the customary manner. 'Thecutting ofl of the current from the motor at once causes the holdingclutch to come into action as above described.

In designing the above described apparatus the parts are so proportionedthat the pressure on the clutch plates is such. as to cause suificientfriction to balance the tendency of the load to rotate the drum, plus aslight excess suflicient to bring the load to a stop and hold it when.the hoisting current is cut ofl. This excess pressure is practicallyconstant with varying loads.

effected by driving it down with the brake a bodily rotatable structurefor transmit-1,

ting power from the motor to the drum; and holding mechanismautomatically actuated by bodily rotation of said structure forpreventing revolution of saiddrum under predetermined conditions. I

2. The combination in a hoisting apparatus of a motor; a drum; gearingof which a portion is bodily, rotatable connecting the motor and thedrum; and holding mechanism actuated by bodilyrotation of a portion ofsaid gearing for preventing, revolution of said drum under predeterminedconditions.

3. The combination in a hoisting apparatus of a motor; a 'drum; meansincluding gearing for transmitting power from the motorto' the drum; aholding clutch; and a lever mechanism actuated by said gearing forcausing said power transmitting means to apply the clutch to preventrevolution of the drum under predetermined conditions.

4;. The combination in a hoisting apparatus of a motor; a drum; meansfor operatively connecting said motor and drum, including gearing and arotatable member supporting a portion of said gearing and mounted toexert a pressure proportional to the load on the drum; with a clutchactuated by bodily rotation of said portion of the gearing forpreventing rotation of the drum under predetermined conditions.

5. The combination in a hoisting apparatus of a motor; a drum; arotatably mounted frame; gearing carried by the frame for operativelyconnecting'the motor V and the drum; and means actuated by the framewhen the drum tends to turn in one direction, for preventing revolutionof said drum.

6. The combination of a motor; a drum; means including a rotatablesupporting element for transmitting power between said motor and drum;and a plate clutch connected to be actuated by pressure exerted by saidelement for applying to the drum a holding force proportional to theload tendin to rotate said drum.

The combination in a hoisting apparatus of a motor; a drum; a rotatablymounted frame; gearing mounted on said frame for operatively connectingthe motor and the drum; a holding clutch; and lever mechanism actuatedby the frame for applying the clutch to prevent revolution of the drumunder predetermined conditions.

8. The combination in a hoisting mechanism of a motor; a drum; meansincluding a rotary supporting element for transmitting power from themotor to the drum; a

holding clutch actuated by rotation of said element to pieventrevolution of the drum when the motor is not in operation; and means forcausing release: of said clutch when the motor is operated.

9. The combination in a hoisting mechanism of a motor; a drum; meansincluding a rotary supporting element for transmitting power from themotor to the drum; a lever actuated by rotation of said element; aholding clutch actuated by said lever to prevent revolution of the drumwhen the motor is not in operation; and means for causing the release ofsaid clutch when the motor is operated to cause the drum to hoist aload.

10. The combination in a hoisting apparatus of a motor; a drum; meansfor operatively connecting said motor and drum; a rotary membersupporting certain elements of said means to permit of their bodilyrotation; and a clutch actuated by said bodily rotation of said elementsfor preventing revolution of the drum under-predetermined conditions. I

11. The combination in a hoistingw mechanism of a motor; a drum; meansfor transmitting power from the motor to the drum; a holding clutchactuated by said means to prevent revolution of the drum when the motoris not in operation; and means for causin the release of said clutchwhen the motor 18 operated to cause the drum to hoist a load, the samebeing arranged .to exert a releasing force on the clutch when the motoris lowering a load. I

12. The combination in a hoisting apparatus of a motor; a drum; meansincluding a rotatable element for transmitting power from the motor tothedrum; a clutch operated by rotation of said element to preventrevolution of the drum when the motor is not in operation; andelectro-magnetic means for releasing the clutch when the mo tor operatesthe drum.- Q

13. The combination in a hoisting apparatus of a motor; a drum; meansincluding gearing and a rotary supporting element for transmitting powerfrom the motor to the drum; a clutch operated by rotation of saidelement under the action of thegearing to prevent revolution of the drumwhen the motor is not in operation; and 'electro-magnetic means forreleasing the clutch when the motor operates the drum to hoist a load.

14. The combination in a hoisting apparatus of a motor; a drum; meansincluding a bodily rotatable structure for transmitting power from themotor to the drum; a clutch operated by rotation of said structure tomagnet in circuit with the motor when the latter operates the drum tohoist a load, for releasing the clutch. 15. The combination in ahoisting apparatus of a motor; a drum; a rotatably mounted frame;gearing on the frame for transmitting power from the motor to the drum;a clutch having a pressure plate; and a device connecting the frame andsaid plate for actuating the clutch. v 16. The combination in a hoistingapparatus of a motor; a drum; a rotatably mounted frame; gearing on theframe for transmitting power from the motor to the drum; a clutch havinga pressureplate; a device connecting the frame and said plate foractuating the clutch; and an electromagnet in circuit with the'motorunder certain conditions and operative on the pressure plate to releasethe clutch when the drum is driven to hoist a load.

17. The combination in a hoisting appanot in operation; electromagneticmeans for a device for causin said electromagnetic means to exert a dierent amount of force on the clutch when the motor is hoisting from thatexerted whenit is lowering a load. 18.- The combination in a hoistingapparatus of a motor; a drum; means for transmitting power fromthe-motorto the drum; a clutch operated by said means to prevent revolution ofthe drum when the motor is not in operation; a sectional electromagnetoperative to exert areleasing force on the clutch and means forenergizing all or a part of the sections of said magnet at will.

In testimony whereof, We have signed our names to this specification, inthepresence of two subscribing witnesses.

FRANK MARIS. CHAS. E. MARIS.

\ exerting a releasing force on the clutch; and

